jerrymountjoy
Recruit
- Joined
- May 6, 2014
- Messages
- 1
1996 Mercury outboard, SN 0G369366, Model 1-0604125
When I first start the motor (after sitting a few days) it billows white smoke for 3-5 minutes. Pulling the cover, I can see oil in the bottom, and I can see an oil slick (slight) behind the boat. This has been going on for quite some time. The local shop diagnosed the problem as carburetor related, and rebuilt the carburetors. That was good for about a week. Followup inspections by the same shop found some loose bolts and other possible causes; tried again but the leaks continued and soon became so bad the reservoir would lose half its content over a few days while not in use. The mechanic contacted Mercury and they determined the jets (I'm talking from memory now, but I think that's what it was) were the wrong size, so they completely rebuilt the carburetors again and it seemed to be working well for the first month or so. Now the billowing smoke is back.
There are no obvious leaking points. We've all looked and relooked at the hoses and connections. And it seems clear that the oil is leaking into the carburetors, causing all the smoke on startup.
What are we overlooking?
When I first start the motor (after sitting a few days) it billows white smoke for 3-5 minutes. Pulling the cover, I can see oil in the bottom, and I can see an oil slick (slight) behind the boat. This has been going on for quite some time. The local shop diagnosed the problem as carburetor related, and rebuilt the carburetors. That was good for about a week. Followup inspections by the same shop found some loose bolts and other possible causes; tried again but the leaks continued and soon became so bad the reservoir would lose half its content over a few days while not in use. The mechanic contacted Mercury and they determined the jets (I'm talking from memory now, but I think that's what it was) were the wrong size, so they completely rebuilt the carburetors again and it seemed to be working well for the first month or so. Now the billowing smoke is back.
There are no obvious leaking points. We've all looked and relooked at the hoses and connections. And it seems clear that the oil is leaking into the carburetors, causing all the smoke on startup.
What are we overlooking?